The Big Lorry to Camper Conversion

Minxy Girl

LIFE MEMBER
Aug 22, 2007
19,580
20,074
E Yorks
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149
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Globecar Campscout
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Since 1996
REWIND REWIND....
IGNORE MY POST ABOVE.

Only just realised that 230ah is PER AGM I fail at reading...

Scrap my calculations (or double the AGM values and redo the figures).. If someone else wants to re write my post correctly and post it below, be my guest I'm not going through it again :D :D
I did notice you weren't very good at reading but didn't like to mention it due to Rule 1 and the fact that I don't want to go to Coventry! :giggle:
 
Last edited:

Gromett

Funster
Feb 27, 2011
9,847
24,985
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15,452
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Been on that website a few times when I was thinking about building my own ( got the original idea from Jehu Garcia :D
Better bang for buck came from making the battery out of second life cylindrical cells.
I considered building my own, but they I couldn't find LiFePO4 in 18650 format either new or second hand. I won't put any other chemistry in my van due to fire risk. LiFePO4 is the only one that is safe in my opinion.

I also used to follow Jehu.
 

Minxy Girl

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Aug 22, 2007
19,580
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Any good?

 
May 29, 2019
234
376
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temporarily MH-less
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I don't know why people keep saying this. In my experience (14 years) they have proven to be the most reliable and stable batteries I have owned. They would be my second choice after Lithium.
It will of course depend on one's usage pattern. How deep do you discharge them?
 

Gromett

Funster
Feb 27, 2011
9,847
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UK
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Any good?

Expensive? Brand new 200Ah cells are only $240

That works out at £240 I believe once you have added the vat on.

I would prefer to buy new and get a warranty.
 

Minxy Girl

LIFE MEMBER
Aug 22, 2007
19,580
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Gromett I'm just trying to get my head round this, I assume for a 12v system it would be necessary to have 4 x cells? That would be £960, plus carriage (if not included), plus any import tax, any other bits you'd need to install them. This would give you 800ah of battery power though! :)
 
Mar 11, 2016
4,784
6,884
Bristol
Funster No
41,967
MH
Fiat Ducato PVC
Exp
12
Just browsing through the forum and noticed that you need an inverter and sallylillian has one for sale, see thread



If anyone wants a 3kw 120amp inverter charger complete with remote and battery monitor I will let the whole package go for £750. Its £2000 list and virtually unused. Ideal for those with a less geeky nature.”
 
OP
MANGOFORTH
Aug 6, 2019
215
1,430
Norwich
Funster No
63,049
MH
7.5t Lorry
Exp
Zilch
Gromett I'm just trying to get my head round this, I assume for a 12v system it would be necessary to have 4 x cells? That would be £960, plus carriage (if not included), plus any import tax, any other bits you'd need to install them. This would give you 800ah of battery power though! :)
I can't really understand either. I think when you change the voltage to 12 the amps change to 220......i think I dunno 🤷‍♂️
 

sallylillian

LIFE MEMBER
Oct 29, 2011
2,710
1,878
Falmouth, Cornwall
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18,670
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Morelo Palace Liner 88LB
Exp
2011
Just browsing through the forum and noticed that you need an inverter and sallylillian has one for sale, see thread



If anyone wants a 3kw 120amp inverter charger complete with remote and battery monitor I will let the whole package go for £750. Its £2000 list and virtually unused. Ideal for those with a less geeky nature.”
Sorry, I posted a For Sale on here and it sold next day, so gone.
 
Sep 16, 2016
3,011
5,200
Near the junction of the A14 and A1, Cambs
Funster No
45,145
MH
Elddis Autoquest 175
Exp
Since 2010
Gromett I'm just trying to get my head round this, I assume for a 12v system it would be necessary to have 4 x cells? That would be £960, plus carriage (if not included), plus any import tax, any other bits you'd need to install them. This would give you 800ah of battery power though! :)
No, the 4 batteries at 3.2 volt joined together in series will bring the pack voltage to 12.8 volt but the capacity remains at 210Ah
Join the 4 batteries in parallel and the voltage remains at 3.2 volts and the capacity goes up to 840Ah.

This might help to explain it.

https://www.batterystuff.com/kb/articles/battery-articles/battery-bank-tutorial.html
 

Minxy Girl

LIFE MEMBER
Aug 22, 2007
19,580
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E Yorks
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149
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No, the 4 batteries at 3.2 volt joined together in series will bring the pack voltage to 12.8 volt but the capacity remains at 210Ah
Join the 4 batteries in parallel and the voltage remains at 3.2 volts and the capacity goes up to 840Ah.

This might help to explain it.

https://www.batterystuff.com/kb/articles/battery-articles/battery-bank-tutorial.html
Yup I realised that earlier 🤪
I suppose it could be 200ah at 12v or 800ah at 3v ... confusing ain't it!
 
Aug 5, 2018
1,002
2,533
Cheltenham
Funster No
55,394
MH
Burstner T-625
upload to Youtube, go to "studio" in settings drop down, choose the video thumbnail and change public to unlisted if you only want it available to be seen here!
 
Oct 2, 2008
3,099
4,248
J10 M40
Funster No
4,247
MH
Bucher Duro 6x6 motorhome
Exp
since 1968
In my RV the 4 x 6v 235ah were connected in series and parallel to give 12v and 470 ah That should help make it easier to understand . :)
 
OP
MANGOFORTH
Aug 6, 2019
215
1,430
Norwich
Funster No
63,049
MH
7.5t Lorry
Exp
Zilch
Right I need to clarify that I am stupid. That doesn't make it any easier. I'm just going to continue to ignore the electrics untill I need to do it 😂😂

Mr Ed why are you going to spy on me 🙄😂
 

Minxy Girl

LIFE MEMBER
Aug 22, 2007
19,580
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E Yorks
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149
MH
Globecar Campscout
Exp
Since 1996
In my RV the 4 x 6v 235ah were connected in series and parallel to give 12v and 470 ah That should help make it easier to understand . :)
Right I need to clarify that I am stupid. That doesn't make it any easier. I'm just going to continue to ignore the electrics untill I need to do it 😂😂
Okay, here goes!

Each of his batteries is 6v and 235ah capacity

To make them usable as 12v he needed to link 2 together in series:

2 x 6v = 12v but the ah rating stays the same at 235ah​

In effect he's used 2 x 6v ones to make a single 12v 235 ah battery.

He then made another one:

2 x 6v = 12v @ 235ah, so now has in effect 2 x 12v 235ah batteries.​

He then connected the 2 x 12v batteries in parallel so the voltage stays at 12v but the ah rating is doubled:

(6v + 6v) + (6v + 6v) = 2 @ 12v​
2 x 12v @ 235ah = 470ah​

It's a bit early for me but I think that's right!
 
Dec 18, 2010
826
798
Norfolk.
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14,705
MH
Low profile,Rollerteam,
Exp
2008-20??
Right I need to clarify that I am stupid. That doesn't make it any easier. I'm just going to continue to ignore the electrics untill I need to do it 😂😂

Mr Ed why are you going to spy on me 🙄😂
not trying to spy,just wondered, North,South,East or West?
 
Oct 29, 2009
1,581
1,533
Derby
Funster No
9,111
MH
Dethleffs
Exp
Since 2006
Okay, here goes!

Each of his batteries is 6v and 235ah capacity

To make them usable as 12v he needed to link 2 together in series:

2 x 6v = 12v but the ah rating stays the same at 235ah​

In effect he's used 2 x 6v ones to make a single 12v 235 ah battery.

He then made another one:

2 x 6v = 12v @ 235ah, so now has in effect 2 x 12v 235ah batteries.​

He then connected the 2 x 12v batteries in parallel so the voltage stays at 12v but the ah rating is doubled:

(6v + 6v) + (6v + 6v) = 2 @ 12v​
2 x 12v @ 235ah = 470ah​

It's a bit early for me but I think that's right!
A good, clear, explanation.

Ian
 
OP
MANGOFORTH
Aug 6, 2019
215
1,430
Norwich
Funster No
63,049
MH
7.5t Lorry
Exp
Zilch
Progress is so slow. We have to move house AGAIN, such a pain as I've had loads of ply ect delivered 😐. Very much focused on the rest of life atm so our Halloween deadline is out the window.

Finally got round to bolting it down, no need to sit up worrying about strong winds anymore. Think my camera is covered in some form of poo, hence the rubbish quality. 1571334213618.jpg
 
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